Sample #92LM2 - Slater Creek Member (Oregon) (Eocene of the United States)

Also known as Record #2

Where: Douglas County, Oregon (43.3° N, 123.1° W: paleocoordinates 47.3° N, 104.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Slater Creek Member (Bushnell Rock Formation), Ypresian (56.0 - 47.8 Ma)

• From Slater Creek Member of the Bushnell Rock Formation, Umpqua Group. This is equivalent to strata formely referred to as Bushnell Rock Member and Umpqua Formation and time equivalent to Lookingglass Formation. The Slater Creek Member unconformably overlies the Siletz RIver Volcanics and underlies the Tenmile Formation. Macrofossil biostratigraphy suggests an Early Paleocene-late Mid-Eocene age, but the member is more precisely dated as Penutian (C24n/CP10)=Ypresian.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified, fine-grained sandstone

• Deposition in shallow water neritic conditions; 25-35 m.
• Thick-bedded, fine-grained sandstone facies. Presumed to be at least poorly lithified given facies, local tectonics and thickness of overlying strata - but not stated in text.

Size class: macrofossils

Collection methods: quarrying,

• Collected by L. Marincovich (1992). Collections presumably reposited at USGS Menlo Park or USNM.

Primary reference: R. E. Wells, A. S. Jayko, A.R. Niem, G. Black, T. Wiley, E. Baldwin, K. Molenaar, K.L. Wheeler, C.B. DuRoss and R.W. Givler. 2000. Geologic Map and Database of the Roseburg 30 x 60' Quadrangle, Douglas and Coos Counties, Oregon. United States Geological Survey Open-File Report 00-367 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 52266: authorized by Austin Hendy, entered by Austin Hendy on 02.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Presumably identified by L. Marincovich
Bivalvia
 Nuculida - Nuculidae
Acila decisa Conrad 1855 divaricate nutclam
 Nuculanida - Yoldiidae
Yoldia sp. Möller 1842 clam
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Mytilida - Mytilidae
Brachidontes cowlitzensis Weaver and Van Winkle Palmer 1922 mussel
 Cardiida - Veneridae
"Microcallista conradiana" = Microcallista (Costacallista) conradiana Gabb 1864 venus clam
Pitar sp. Römer 1857 venus clam
 Cardiida - Cardiidae
"Acanthocardia brewerii" = Schedocardia brewerii
"Acanthocardia brewerii" = Schedocardia brewerii Gabb 1864 cockle
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Gastropoda
 Sorbeoconcha - Naticidae
? Natica sp. Scopoli 1777 moon snail
 Neogastropoda - Fasciolariidae
Fusinus sp. Rafinesque 1815 snail
 Sorbeoconcha - Strombidae
"Ectinochilus sp." = Rimella
"Ectinochilus sp." = Rimella Agassiz 1840 true conch
 Opisthobranchia - Retusidae
Cylichnina tantilla Anderson and Hanna 1925 snail